期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 6, 期 23, 页码 8314-8324出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cy01820c
关键词
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资金
- Megagrant of the Russian Federation Government [14.Y26.31.0001]
- Innovation Fund Denmark [5190-00018B]
- [CPi-2796.2016.1]
The equilibrium reaction between NO and Cu-nitrate, Cu.II)-NO3- + NO(g). Cu(II)-NO2- + NO2(g), has been proposed to be a key step in the selective catalytic reduction of NO by ammonia (NH3-SCR) over Cu-CHA catalysts and points to the presence of Cu-nitrites. Whereas the formation of gaseous NO2 has been observed, a direct observation of Cu-nitrite groups under conditions relevant to NH3-SCR has been so far unsuccessful. In an effort to identify and characterize Cu-nitrites, the reaction between Cu-nitrates hosted in the CHA zeolite and NO is investigated by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-vis) and X-ray absorption spectroscopy (XAS). We find that NO reacts with Cu-nitrates and that about half of the Cu-nitrate species are converted. After the reaction, the Cu(II) state is different from the original oxidized state. Analysis of XAS data indicates that the final state of the Cu-CHA catalyst is consistent with the partial conversion of the Cu-nitrate species to a bidentate Cu-nitrite configuration.
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